Fatigue Life Assessment Using Signal Processing Techniques
|
|
- Estella Alexander
- 5 years ago
- Views:
Transcription
1 Fatigue Lie Assessment Using Signal Processing Techniques S. ABDULLAH 1, M. Z. NUAWI, C. K. E. NIZWAN, A. ZAHARIM, Z. M. NOPIAH Engineering Faculty, Universiti Kebangsaan Malaysia UKM Bangi, Selangor, MALAYSIA Abstract: - This paper presents the atigue lie assessment using signal processing approaches which study on the characteristics o the atigue signal in requency and time-requency domain. The signals used in this research were variable amplitude atigue signal which consisted o a synthetic data and experimentally measured data. As requency domain method is one o the techniques to analyse random signal, it can be applied to observe strain characteristic o the signal in requency domain. Thus, Power Spectral Density (PSD) algorithm was used to gain the power distribution o the input signals. The short-time Fourier transorm (STFT) method was then used to transorm the input signal into the time-requency domain. The transormation o time domain signal into time-requency domain provides the power distribution display with respect to the particular time and requency inormation. From the power distribution gained, the atigue damage eatures can be identiied. Finally, the lie estimation o the components was calculated in order to study its durability. Key-Words: - Automotive, Fatigue, Fatigue road loadings, Signal processing, Simulation, Variable amplitude. 1 Introduction For many automotive components, the primary mode o ailure can be attributed to atigue damage resulting rom the application o variable amplitude loading. Predicting the lie o part stressed above the endurance limit is at best a rough procedure especially or components like automobile engine, steering and suspension parts [1]. For these cases, the strain-based approach is commonly used to predict atigue lie [2]. The strain-lie atigue model relates the plastic deormation that occurs at a localized region where atigue cracks begin to the durability o the structure. This model is oten used or ductile materials at relatively short atigue lives. This approach can also be used where there is little plasticity at long atigue lives. Thereore, this is a comprehensive approach that can be used in place o the stress-based approach. In signal processing approach, the atigue signal can be analysed in requency domain and time requency domain. Frequency analysis data is typically presented in graphical orm as Power Spectral Density (PSD). Essentially a PSD display the amplitude o each sinusoidal wave o a particular requency. Frequency is given on the x-axis. The mean squared amplitude o a sinusoidal wave at any requency can be determined by inding the area under the PSD over that requency range [3]. The short-time Fourier transorms (STFT) or windowed Fourier transorm is one o the methods or transorming the time domain signal into the timerequency domain. In addition, the STFT adapted the Fourier transorm to analyse only a small section o the signal at one speciic time [4]. Finally, the STFT provides inormation on when and at what requencies a signal occurs. In this paper, two atigue signals were analysed using signal processing approach in order to observe the signal characteristics in requency and timerequency domain. The atigue lie or each signal was then predicted using strain lie based to study the durability o the structures under variable amplitude loading. 2 Methodology The methodology o this activity involves the atigue data measurement and also atigue data analysis. The purpose o this type o analysis is to veriy the durability o a component ater being aected by a spectrum atigue loading, which lead to the improvement o the structural integrity o any related system. Two data sets have been used or this study, named as T1 (a synthetic data) and T2 (experimentally measured data). The logic o creating T1, as shown in Fig. 1a, was to observe the data processing ability to deal with any signal containing large transients in a small amplitude background, so that the high amplitude events which lead to the atigue damage can be properly identiied [5,6]. This data was deined with 16,000 data points and sampled at 400 Hz. It consists o a combination o sinusoidal and random signals o ISSN:
2 various amplitudes and requencies, and it was intentionally deined to be a mixture o both high amplitude events and low amplitude harmonic background. The second, named as T2 (see Fig. 1b), is a atigue strain signal that was measured on a component o a speciic structural system. It was sampled at 200 Hz or a total o 30,000 data points that produced a total record length o 150 seconds. This signal exhibits a slight change in mean o the whole signal with a little low requency content. This data set was chosen because it contained many transient events in the signal background. The data was measured using atigue data acquisition system, called SOMAT edaq, and urther analysis or both T1 and T2 was perormed using the sotware developed by ncode International, i.e. GlyphWorks. Fig. 2 shows the schematic arrangement or data collection and analysis. Data collection (a) (b) Fig. 1: Data collected or the analysis GlyphWorks Data analysis Fig. 2: The concept o data collection and analysis 3 Results and Discussions: Signal Analysis The analysis o the collected data or both T1 and T2 was statistically carried out in order to determine the meaningul statistical properties or the atigue damage analysis. This global signal statistical analysis is also being perormed or determining determination o the signal behaviour. The signal root-mean-square (r.m.s.) value, which is the 2nd statistical moment, is used to quantiy the overall energy content o the oscillatory signal. The kurtosis, which is the signal 4th statistical moment value, is also being used to quantiy the nongaussianity o the data since it is highly sensitive to outlying data among the instantaneous values. For both data sets, these statistical parameters are tabulated in Table 1. Table 1: The statistical values or T1 and T2 Signal Mean Root- Kurtosis length [seconds] [με] mean- square [με] T T The power spectral density (PSD) analysis is later being perormed or observing the distribution o vibrational signal energy across the requency domain. A PSD is used to convert a signal rom the time domain to the requency domain using the ast Fourier transorm (FFT) method. In the relation o the PSD with the FFT, the PSD is a normalised density plot describing the mean square amplitude o each sinusoidal wave with respect to its requency. The plot o PSD or both T1 and T2 can be seen in Fig. 3, showing that both signals contain the atigue damage eatures in the low requency distribution. It shows the same argument with the theoretical indings, i.e. the low amplitude events o the atigue cycles can be ound in the higher requency distribution o a requency spectrum. With the application o low pass ilter, these high requency cycles with low strain amplitude can be removed. Short-time Fourier transorm (STFT) is a method o time-requency analysis which aims to produce requency inormation which has a localisation in time [7]. It provides inormation about when and at what requencies a signal event occurs. The STFT approach assumes that i a time-varying signal is divided into several segments, each can be assumed stationary or analysis purposes. The Fourier transorm is applied to each o the segments using a window unction and the most important parameter in the analysis is the window length, which is chosen so as to isolate the signal in time without any distortions. ISSN:
3 components, it is also easible to predict crack initiation so as to avoid atigue ailure by monitoring and preventing the part rom ailure at the appropriate time. A atigue lie estimate is usually made in such cases by means o a strain-based approach [2,8,9]. (a) Fig. 3: The plots o PSD showing the vibrational energy distributed at lower requency range or: (a) T1, (b) T2 Fig. 4 shows the distribution o time-requency localisation o a random signal, or also known as the power spectrum mapping o the STFT. In Fig. 4a, ive localisation areas (other than blue colour mapping) can be seen which indicate the presence o the ive segments o high amplitude events in the synthetic signal o Fig. 1a. This result shows that the capability o the STFT localisation method to be used as the eatures extraction or the determination o atigue damage events. The same argument can also be made or the experimental signal o Fig. 1b, or which its STFT localisation plot is presented in Fig. 4b. In this igure, some o higher (other than blue colour mapping) can be ound across the signal length, showing the occurrence o atigue damage events at those areas. 4 Results and Discussions: Fatigue Lie Assessment The service loads o mechanical structures or systems are typically analysed or atigue lie using crack growth approaches. This approach is suitable or high capital value items such as large aircrat, the space shuttle, pressure vessels and oil rigs [2]. The ability to inspect or cracks and monitor their growth until a maximum allowable deect size is reached, normally enables the useul lie to be extended beyond the original design sae lie. For these (b) Fig. 4 The STFT plots showing the localisation mapping or: (a) T1, (b) T2 The strain-lie atigue models relate the plastic deormation that occurs at a localised region where atigue cracks begin to the durability o the structure. This model is oten used or ductile materials at relatively short atigue lives. This approach is also used where a little plasticity is acceptable at long atigue lives. Thereore, strain-based approaches are comprehensive and can be used in place o stressbased approaches. Current industrial practice or atigue lie prediction is to use the Palmgren-Miner (PM) linear damage rule. For strain-based atigue lie prediction, this rule is normally applied with strain-lie atigue damage models, such as the Coin-Manson relationship, i.e. σ ' b ' ε ( ) ( ) c a = 2N + ε 2N (1) E where E is the material modulus o elasticity, εa is a true strain amplitude, 2N is the number o reversals to ailure, σ is a atigue strength coeicient, b is a ISSN:
4 atigue strength exponent, ε is a atigue ductility coeicient and c is a atigue ductility exponent. According to the analysis presented in this paper using both signals, the atigue lie assessment was perormed using the GlyphWorks sotware package. The basic procedure o perorming this kind o durability analysis is the application o service load (atigue data) onto a component which was abricated rom the designated material. Thereore, the SAE1018 carbon steel was selected or the purpose o simulation, and also this kind o material are also being used in the piping industry. The strain-lie curve that indicates the atigue lie at speciic strain amplitudes was presented in Fig. 5. Fig. 6 shows the histogram plots o the atigue damage potential, showing highest point o atigue damage in the red colour. This damage value was calculated using the Coin-Manson relationship, based on the N value when reerring to Equation (1). Thus, the atigue damage (D) can then be calculated as in Equation (2): 1 D = (2) N Using both Equation (1) and (2), the atigue lives or both signals were calculated and are presented in Table 2. Signal length [seconds] Fatigue lie Blocks to ailure] Total time to ailure [hours] T x x 10 7 T x Fig. 6: The histogram plots exhibiting the atigue damage distribution or the analysed signals: (a) T1, (b) T2 Fig. 5: The strain-live curve or SAE1018 carbon steel Table 2: The atigue lie values or T1 and T2 5 Conclusions This works has been presented in order to expose a better overview o structural integrity assesment o structural or system components using the combinantion approach o signal analysis and atigue lie assessment. It can be said as a new approach introduced to the structural integrity reseach since the last decade. In this paper, two atigue strain loadings, or later called signals, which exhibiting the variable amplitude pattern has been analysed using the MatLab (or signal analysis) and the GlyphWorks (or atigue lie assessment) ISSN:
5 sotware packages. With the application o the shorttime Fourier transorm (STFT), the atigue damage eatures can be identiied. Later part o this paper, the atigue lives or both signals were calculated, indicating how long a component can be lasted without ailure under the given strain loading. Finally, it is suggested that the approach presented in this paper can be then be applied or determining the lie span o any metallic structures. Reerences: [1] A. Conle, R. Landgra, A atigue analysis program or ground vehicle components, Proceedings o the International Conerence on Digital Techniques in Fatigue, London, 1983, pp [2] NE. Dowling. Mechanical Behaviour o Materials: Engineering Methods or Deormation Fracture and Fatigue, 2 nd ed., Prentice Hall, New Jersey, [3] nsot User Manual, 2001, ncode International Ltd., Sheield. [4] Matlab User s Guide, Matlab 5.2, The Math Works, [5] S. Abdullah and A. Zaharim. Using the orthogonal wavelet transorm to identiy atigue eatures in variable amplitude atigue loadings, WSEAS Transactions on Signal Processing, Vol. 2, Issue 10 (October 2006), 2006, pp [6] S. Abdullah, J.C Choi, J.A Giacomin, and J.R Yates. Bump extraction algorithm or variable amplitude atigue loadings, International Journal o Fatigue, Vol. 28, No. 7, 2006, pp [7] W.J Staszewski, Wavelet based compression and eature selection or vibrational analysis, Journal o Sound and Vibration, Vol. 211, No. 5, 1998, pp [8] J.A Collins. Failure o Materials in Mechanical Design, Wiley, New York [9] J.H Yan, X.L Zheng and K. Zhao, Experimental investigation on the small-loadomitting criterion, Int. J. Fatigue, Vol. 23, 2001, pp ISSN:
IDENTIFICATION OF FATIGUE DAMAGING EVENTS USING A WAVELET-BASED FATIGUE DATA EDITING ALGORITHM
IDENTIFICATION OF FATIGUE DAMAGING EVENTS USING A WAVELET-BASED FATIGUE DATA EDITING ALGORITHM S. Abdullah, J.A. Giacomin 2 and J.R. Yates 3 Department of Mechanical Engineering, The University of Sheffield
More informationAbrupt Changes Detection in Fatigue Data Using the Cumulative Sum Method
Abrupt Changes Detection in Fatigue Using the Cumulative Sum Method Z. M. NOPIAH, M.N.BAHARIN, S. ABDULLAH, M. I. KHAIRIR AND C. K. E. NIZWAN Department of Mechanical and Materials Engineering Universiti
More informationSEG/San Antonio 2007 Annual Meeting. Summary. Morlet wavelet transform
Xiaogui Miao*, CGGVeritas, Calgary, Canada, Xiao-gui_miao@cggveritas.com Dragana Todorovic-Marinic and Tyler Klatt, Encana, Calgary Canada Summary Most geologic changes have a seismic response but sometimes
More informationArtefact Characterisation for JPEG and JPEG 2000 Image Codecs: Edge Blur and Ringing
I'.NCINEER- Vol. XXXX, No. 3, pp. 25-3, 27
More informationSinusoidal signal. Arbitrary signal. Periodic rectangular pulse. Sampling function. Sampled sinusoidal signal. Sampled arbitrary signal
Techniques o Physics Worksheet 4 Digital Signal Processing 1 Introduction to Digital Signal Processing The ield o digital signal processing (DSP) is concerned with the processing o signals that have been
More informationThe Research of Electric Energy Measurement Algorithm Based on S-Transform
International Conerence on Energy, Power and Electrical Engineering (EPEE 16 The Research o Electric Energy Measurement Algorithm Based on S-Transorm Xiyang Ou1,*, Bei He, Xiang Du1, Jin Zhang1, Ling Feng1,
More informationA new zoom algorithm and its use in frequency estimation
Waves Wavelets Fractals Adv. Anal. 5; :7 Research Article Open Access Manuel D. Ortigueira, António S. Serralheiro, and J. A. Tenreiro Machado A new zoom algorithm and its use in requency estimation DOI.55/wwaa-5-
More informationECEN 5014, Spring 2013 Special Topics: Active Microwave Circuits and MMICs Zoya Popovic, University of Colorado, Boulder
ECEN 5014, Spring 2013 Special Topics: Active Microwave Circuits and MMICs Zoya Popovic, University o Colorado, Boulder LECTURE 13 PHASE NOISE L13.1. INTRODUCTION The requency stability o an oscillator
More informationFurther developments on gear transmission monitoring
Further developments on gear transmission monitoring Niola V., Quaremba G., Avagliano V. Department o Mechanical Engineering or Energetics University o Naples Federico II Via Claudio 21, 80125, Napoli,
More informationNoise Removal from ECG Signal and Performance Analysis Using Different Filter
International Journal o Innovative Research in Electronics and Communication (IJIREC) Volume. 1, Issue 2, May 214, PP.32-39 ISSN 2349-442 (Print) & ISSN 2349-45 (Online) www.arcjournal.org Noise Removal
More informationDevelopment of New Algorithm for Voltage Sag Source Location
Proceedings o the International MultiConerence o Engineers and Computer Scientists 2009 Vol II IMECS 2009, March 8-20, 2009, Hong Kong Development o New Algorithm or Voltage Sag Source Location N. Hamzah,
More informationDSP APPLICATION TO THE PORTABLE VIBRATION EXCITER
DSP PPLICTION TO THE PORTBLE VIBRTION EXCITER W. Barwicz 1, P. Panas 1 and. Podgórski 2 1 Svantek Ltd., 01-410 Warsaw, Poland Institute o Radioelectronics, Faculty o Electronics and Inormation Technology
More information2015 HBM ncode Products User Group Meeting
Looking at Measured Data in the Frequency Domain Kurt Munson HBM-nCode Do Engineers Need Tools? 3 What is Vibration? http://dictionary.reference.com/browse/vibration 4 Some Statistics Amplitude PDF y Measure
More informationA MATLAB Model of Hybrid Active Filter Based on SVPWM Technique
International Journal o Electrical Engineering. ISSN 0974-2158 olume 5, Number 5 (2012), pp. 557-569 International Research Publication House http://www.irphouse.com A MATLAB Model o Hybrid Active Filter
More informationMotor Gear Fault Diagnosis by Current, Noise and Vibration on AC Machine Considering Environment Sun-Ki Hong, Ki-Seok Kim, Yong-Ho Cho
Motor Gear Fault Diagnosis by Current, Noise and Vibration on AC Machine Considering Environment Sun-Ki Hong, Ki-Seok Kim, Yong-Ho Cho Abstract Lots o motors have been being used in industry. Thereore
More informationSolid State Relays & Its
Solid State Relays & Its Applications Presented By Dr. Mostaa Abdel-Geliel Course Objectives Know new techniques in relay industries. Understand the types o static relays and its components. Understand
More informationEarly Detection of Rolling Bearing Faults Using an Auto-correlated Envelope Ensemble Average
Proceedings o the 23rd International Conerence on Automation & Computing, University o Huddersield, Huddersield, UK, 7-8 September 2017 Early Detection o Rolling Bearing Faults Using an Auto-correlated
More informationDARK CURRENT ELIMINATION IN CHARGED COUPLE DEVICES
DARK CURRENT ELIMINATION IN CHARGED COUPLE DEVICES L. Kňazovická, J. Švihlík Department o Computing and Control Engineering, ICT Prague Abstract Charged Couple Devices can be ound all around us. They are
More information1. Motivation. 2. Periodic non-gaussian noise
. Motivation One o the many challenges that we ace in wireline telemetry is how to operate highspeed data transmissions over non-ideal, poorly controlled media. The key to any telemetry system design depends
More informationCyclostationarity-Based Spectrum Sensing for Wideband Cognitive Radio
9 International Conerence on Communications and Mobile Computing Cyclostationarity-Based Spectrum Sensing or Wideband Cognitive Radio Qi Yuan, Peng Tao, Wang Wenbo, Qian Rongrong Wireless Signal Processing
More informationVibration and Electrical Interference Removal for Improved Bearing Fault Diagnosis
Mechatronics 008, June 3 5, University o Limerick, Ireland ibration and Electrical Intererence Removal or Improved Bearing Fault Diagnosis Iman Soltani Bozchalooi and Ming Liang * Department o Mechanical
More informationModern spectral analysis of non-stationary signals in power electronics
Modern spectral analysis of non-stationary signaln power electronics Zbigniew Leonowicz Wroclaw University of Technology I-7, pl. Grunwaldzki 3 5-37 Wroclaw, Poland ++48-7-36 leonowic@ipee.pwr.wroc.pl
More informationCOMPENSATION OF CURRENT TRANSFORMERS BY MEANS OF FIELD PROGRAMMABLE GATE ARRAY
METROLOGY AD MEASUREMET SYSTEMS Index 330930, ISS 0860-89 www.metrology.pg.gda.pl COMPESATIO OF CURRET TRASFORMERS BY MEAS OF FIELD PROGRAMMABLE GATE ARRAY Daniele Gallo, Carmine Landi, Mario Luiso Seconda
More informationComparative investigation of electric signal analyses methods for mechanical fault detection in induction motors
Comparative investigation o electric signal analyses methods or mechanical ault detection in induction motors Eltabach Mario, Charara Ali,. Faculté des sciences et de génie inormatique, Université de Saint
More informationCurrent Component Index Algorithm for Voltage Sag Source Localization
Proceedings o the World Congress on Engineering Vol II WCE, July 6-8,, London, U.K. Current Component Index Algorithm or Voltage Sag Source Localization N. Hamzah, Member, IAENG, IEEE, A. Mohamed, Senior
More informationDetermination of Pitch Range Based on Onset and Offset Analysis in Modulation Frequency Domain
Determination o Pitch Range Based on Onset and Oset Analysis in Modulation Frequency Domain A. Mahmoodzadeh Speech Proc. Research Lab ECE Dept. Yazd University Yazd, Iran H. R. Abutalebi Speech Proc. Research
More informationSoftware Defined Radio Forum Contribution
Committee: Technical Sotware Deined Radio Forum Contribution Title: VITA-49 Drat Speciication Appendices Source Lee Pucker SDR Forum 604-828-9846 Lee.Pucker@sdrorum.org Date: 7 March 2007 Distribution:
More informationStudy on 3D CFBG Vibration Sensor and Its Application
PHOTONIC SENSORS / Vol. 6, No. 1, 2016: 90 96 Study on 3D CFBG Vibration Sensor and Its Application Qiuming NAN 1,2* and Sheng LI 1,2 1 National Engineering Laboratory or Fiber Optic Sensing Technology,
More informationAssessing Bearing Health for Helicopter Power Train Systems
Assessing Bearing Health or Helicopter Power Train Systems Harrison H. Chin Applied Concept Research, Inc. Bedord, MA 01730 Eric Mayhew and avid L. Green Goodrich Corporation Fuel & Utility Systems Vergennes,
More informationAN EFFICIENT SET OF FEATURES FOR PULSE REPETITION INTERVAL MODULATION RECOGNITION
AN EFFICIENT SET OF FEATURES FOR PULSE REPETITION INTERVAL MODULATION RECOGNITION J-P. Kauppi, K.S. Martikainen Patria Aviation Oy, Naulakatu 3, 33100 Tampere, Finland, ax +358204692696 jukka-pekka.kauppi@patria.i,
More informationNew metallic mesh designing with high electromagnetic shielding
MATEC Web o Conerences 189, 01003 (018) MEAMT 018 https://doi.org/10.1051/mateccon/01818901003 New metallic mesh designing with high electromagnetic shielding Longjia Qiu 1,,*, Li Li 1,, Zhieng Pan 1,,
More informationDetection of Fault in Rolling Element Bearing using Condition Monitoring by Experimental Approach
Detection o Fault in Rolling Element Bearing using Condition Monitoring by Experimental Approach Sakshi Kokil (1) Mechanical Dept NBN Sinhgad School o Engineering Pune (M.S.), India. Assist. Pro. M. M.
More informationTIME-FREQUENCY ANALYSIS OF NON-STATIONARY THREE PHASE SIGNALS. Z. Leonowicz T. Lobos
Copyright IFAC 15th Triennial World Congress, Barcelona, Spain TIME-FREQUENCY ANALYSIS OF NON-STATIONARY THREE PHASE SIGNALS Z. Leonowicz T. Lobos Wroclaw University o Technology Pl. Grunwaldzki 13, 537
More informationDetection and direction-finding of spread spectrum signals using correlation and narrowband interference rejection
Detection and direction-inding o spread spectrum signals using correlation and narrowband intererence rejection Ulrika Ahnström,2,JohanFalk,3, Peter Händel,3, Maria Wikström Department o Electronic Warare
More informationThe Effects of Different Input Excitation on the Dynamic Characterization of an Automotive Shock Absorber
NVC- The Eects o Dierent Input Excitation on the Dynamic Characterization o an Automotive Shock Absorber Copyright Society o Automotive Engineers, Inc. Darin Kowalski, Mohan D. Rao Michigan Technological
More informationValidation of a crystal detector model for the calibration of the Large Signal Network Analyzer.
Instrumentation and Measurement Technology Conerence IMTC 2007 Warsaw, Poland, May 1-3, 2007 Validation o a crystal detector model or the calibration o the Large Signal Network Analyzer. Liesbeth Gommé,
More information( ) D. An information signal x( t) = 5cos( 1000πt) LSSB modulates a carrier with amplitude A c
An inormation signal x( t) 5cos( 1000πt) LSSB modulates a carrier with amplitude A c 1. This signal is transmitted through a channel with 30 db loss. It is demodulated using a synchronous demodulator.
More informationTraditional Analog Modulation Techniques
Chapter 5 Traditional Analog Modulation Techniques Mikael Olosson 2002 2007 Modulation techniques are mainly used to transmit inormation in a given requency band. The reason or that may be that the channel
More informationAmplifiers. Department of Computer Science and Engineering
Department o Computer Science and Engineering 2--8 Power ampliiers and the use o pulse modulation Switching ampliiers, somewhat incorrectly named digital ampliiers, have been growing in popularity when
More informationFundamentals of Spectrum Analysis. Christoph Rauscher
Fundamentals o Spectrum nalysis Christoph Rauscher Christoph Rauscher Volker Janssen, Roland Minihold Fundamentals o Spectrum nalysis Rohde & Schwarz GmbH & Co. KG, 21 Mühldorstrasse 15 81671 München Germany
More informationELEC3106 Electronics. Lecture notes: non-linearity and noise. Objective. Non-linearity. Non-linearity measures
ELEC316 Electronics Lecture notes: non-linearity and noise Objective The objective o these brie notes is to supplement the textbooks used in the course on the topic o non-linearity and electrical noise.
More informationResearch on Fiber Bragg Grating Acoustic Emission Technology Applied in Helicopter Bearing Detection
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 00 (2014) 000 000 www.elsevier.com/locate/procedia APISAT2014, 2014 Asia-Paciic International Symposium on Aerospace Technology,
More informationMax Covering Phasor Measurement Units Placement for Partial Power System Observability
Engineering Management Research; Vol. 2, No. 1; 2013 ISSN 1927-7318 E-ISSN 1927-7326 Published by Canadian Center o Science and Education Max Covering Phasor Measurement Units Placement or Partial Power
More informationMusic Technology Group, Universitat Pompeu Fabra, Barcelona, Spain {jordi.bonada,
GENERATION OF GROWL-TYPE VOICE QUALITIES BY SPECTRAL MORPHING Jordi Bonada Merlijn Blaauw Music Technology Group, Universitat Pompeu Fabra, Barcelona, Spain Email: {jordi.bonada, merlijn.blaauw}@up.edu
More informationECE 5655/4655 Laboratory Problems
Assignment #4 ECE 5655/4655 Laboratory Problems Make Note o the Following: Due Monday April 15, 2019 I possible write your lab report in Jupyter notebook I you choose to use the spectrum/network analyzer
More informationAPPLICATION NOTE #1. Phase NoiseTheory and Measurement 1 INTRODUCTION
Tommorrow s Phase Noise Testing Today 35 South Service Road Plainview, NY 803 TEL: 56-694-6700 FAX: 56-694-677 APPLICATION NOTE # Phase NoiseTheory and Measurement INTRODUCTION Today, noise measurements
More informationPLL AND NUMBER OF SAMPLE SYNCHRONISATION TECHNIQUES FOR ELECTRICAL POWER QUALITY MEASURMENTS
XX IMEKO World Congress Metrology or Green Growth September 9 14, 2012, Busan, Republic o Korea PLL AND NUMBER OF SAMPLE SYNCHRONISATION TECHNIQUES FOR ELECTRICAL POWER QUALITY MEASURMENTS Richárd Bátori
More informationWith the proposed technique, those two problems will be overcome. reduction is to eliminate the specific harmonics, which are the lowest orders.
CHAPTER 3 OPTIMIZED HARMONIC TEPPED-WAVEFORM TECHNIQUE (OHW The obective o the proposed optimized harmonic stepped-waveorm technique is to reduce, as much as possible, the harmonic distortion in the load
More informationOptimizing Reception Performance of new UWB Pulse shape over Multipath Channel using MMSE Adaptive Algorithm
IOSR Journal o Engineering (IOSRJEN) ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 05, Issue 01 (January. 2015), V1 PP 44-57 www.iosrjen.org Optimizing Reception Perormance o new UWB Pulse shape over Multipath
More informationExperiment 7: Frequency Modulation and Phase Locked Loops Fall 2009
Experiment 7: Frequency Modulation and Phase Locked Loops Fall 2009 Frequency Modulation Normally, we consider a voltage wave orm with a ixed requency o the orm v(t) = V sin(ω c t + θ), (1) where ω c is
More informationFault diagnosis of massey ferguson gearbox using power spectral density
Journal of Agricultural Technology 2009, V.5(1): 1-6 Fault diagnosis of massey ferguson gearbox using power spectral density K.Heidarbeigi *, Hojat Ahmadi, M. Omid and A. Tabatabaeefar Department of Power
More informationOverexcitation protection function block description
unction block description Document ID: PRELIMIARY VERSIO ser s manual version inormation Version Date Modiication Compiled by Preliminary 24.11.2009. Preliminary version, without technical inormation Petri
More informationDetermination of Real-time Vortex Shedding Frequency by a DSP
335~342 ( 年 ) Journal o the Chinese Society o Mechanical Engineers, Vol.27, No.3, pp.335~342(26) Determination o Real-time Vortex Shedding Frequency by a DSP Chih-Chung Hu*, Jiun-Jih Miau**and Tzu-Liang
More informationA Real-Time Current Harmonic Monitoring System Based on Stockwell Transform Method
International Review o Electrical Engineering (I.R.E.E.), ol. 11, N. 2 ISSN 1827-6660 March April 2016 A Real-Time Current Harmonic Monitoring System Based on Stockwell Transorm Method Margo Pujiantara,
More informationEEE 311: Digital Signal Processing I
EEE 311: Digital Signal Processing I Course Teacher: Dr Newaz Md Syur Rahim Associated Proessor, Dept o EEE, BUET, Dhaka 1000 Syllabus: As mentioned in your course calendar Reerence Books: 1 Digital Signal
More informationImplementation of an Intelligent Target Classifier with Bicoherence Feature Set
ISSN: 39-8753 International Journal o Innovative Research in Science, (An ISO 397: 007 Certiied Organization Vol. 3, Issue, November 04 Implementation o an Intelligent Target Classiier with Bicoherence
More informationEXPLOITING RMS TIME-FREQUENCY STRUCTURE FOR DATA COMPRESSION IN EMITTER LOCATION SYSTEMS
NAECON : National Aerospace & Electronics Conerence, October -,, Dayton, Ohio 7 EXPLOITING RMS TIME-FREQUENCY STRUCTURE FOR DATA COMPRESSION IN EMITTER LOCATION SYSTEMS MARK L. FOWLER Department o Electrical
More informationDesign Analysis of Low-Pass Passive Filter in Single-Phase Grid-Connected Transformerless Inverter
0 IEEE First Conerence on Clean Energy and Technology CET Design Analysis o Low-Pass Passive Filter in Single-Phase Grid-Connected Transormerless Inverter Maaspaliza Azri and Nasrudin Abd. Rahim Faculty
More informationSequence-based Rendezvous for Dynamic Spectrum Access
Sequence-based endezvous or Dynamic Spectrum Access Luiz A. DaSilva Bradley Dept. o Electrical and Computer Engineering Virginia Tech Arlington, VA, USA ldasilva@vt.edu Igor Guerreiro Wireless Telecommunications
More informationWavelet analysis to detect fault in Clutch release bearing
Wavelet analysis to detect fault in Clutch release bearing Gaurav Joshi 1, Akhilesh Lodwal 2 1 ME Scholar, Institute of Engineering & Technology, DAVV, Indore, M. P., India 2 Assistant Professor, Dept.
More informationMFCC-based perceptual hashing for compressed domain of speech content identification
Available online www.jocpr.com Journal o Chemical and Pharmaceutical Research, 014, 6(7):379-386 Research Article ISSN : 0975-7384 CODEN(USA) : JCPRC5 MFCC-based perceptual hashing or compressed domain
More informationAN INFLUENCE OF SEGMENTED MANDREL ON STRENGTH PROPERTIES OF WOUND MOTOR CASE ICCM-16 PROCEEDINGS
6 TH INTENATIONAL CONFEENCE ON COMPOSITE MATEIALS AN INFLUENCE OF SEGMENTED MANDEL ON STENGTH POPETIES OF WOUND MOTO CASE ICCM-6 POCEEDINGS A.S.Cherevatsky, G.aykin, M.Shabtai, M.Buyum [A.S.Cherevatsky]:
More informationResonant characteristics of flow pulsation in pipes due to swept sine constraint
TRANSACTIONS OF THE INSTITUTE OF FLUID-FLOW MACHINERY No. 133, 2016, 131 144 Tomasz Pałczyński Resonant characteristics of flow pulsation in pipes due to swept sine constraint Institute of Turbomachinery,
More informationThe influence of gouge defects on failure pressure of steel pipes
IOP Conference Series: Materials Science and Engineering OPEN ACCESS The influence of gouge defects on failure pressure of steel pipes To cite this article: N A Alang et al 2013 IOP Conf. Ser.: Mater.
More informationCutting stability investigation on a complicated free surface machining
o Achievements in Materials and Manuacturing Engineering VOLUME 31 ISSUE 2 December 2008 Cutting stability investigation on a complicated ree surace machining S.Y. Lin*, R.W. Chang, C.T. Chung, C.K. Chan
More informationHigh Frequency Acoustic Signal Analysis for Internal Surface Pipe Roughness Classification
High Frequency Acoustic Signal Analysis for Internal Surface Pipe Roughness Classification Z. M. Hafizi, C.K.E. Nizwan, M.F.A. Reza & M.A.A. Johari Faculty of Mechanical Engineering, Universiti Malaysia
More informationModel Correlation of Dynamic Non-linear Bearing Behavior in a Generator
Model Correlation of Dynamic Non-linear Bearing Behavior in a Generator Dean Ford, Greg Holbrook, Steve Shields and Kevin Whitacre Delphi Automotive Systems, Energy & Chassis Systems Abstract Efforts to
More informationESA400 Electrochemical Signal Analyzer
ESA4 Electrochemical Signal Analyzer Electrochemical noise, the current and voltage signals arising from freely corroding electrochemical systems, has been studied for over years. Despite this experience,
More informationSpread-Spectrum Technique in Sigma-Delta Modulators
Spread-Spectrum Technique in Sigma-Delta Modulators by Eric C. Moule Submitted in Partial Fulillment o the Requirements or the Degree Doctor o Philosophy Supervised by Proessor Zeljko Ignjatovic Department
More informationReal time noise-speech discrimination in time domain for speech recognition application
University of Malaya From the SelectedWorks of Mokhtar Norrima January 4, 2011 Real time noise-speech discrimination in time domain for speech recognition application Norrima Mokhtar, University of Malaya
More informationADAPTIVE LINE DIFFERENTIAL PROTECTION ENHANCED BY PHASE ANGLE INFORMATION
ADAPTIVE INE DIEENTIA POTECTION ENHANCED BY PHASE ANGE INOMATION Youyi I Jianping WANG Kai IU Ivo BNCIC hanpeng SHI ABB Sweden ABB Sweden ABB China ABB Sweden ABB - Sweden youyi.li@se.abb.com jianping.wang@se.abb.com
More informationDesign Project: Audio tone control
Design Project: Audio tone control This worksheet and all related iles are licensed under the Creative Commons Attribution License, version 1.0. To view a copy o this license, visit http://creativecommons.org/licenses/by/1.0/,
More informationLock-In Amplifiers SR510 and SR530 Analog lock-in amplifiers
Lock-In Ampliiers SR510 and SR530 Analog lock-in ampliiers SR510/SR530 Lock-In Ampliiers 0.5 Hz to 100 khz requency range Current and voltage inputs Up to 80 db dynamic reserve Tracking band-pass and line
More informationLousy Processing Increases Energy Efficiency in Massive MIMO Systems
1 Lousy Processing Increases Energy Eiciency in Massive MIMO Systems Sara Gunnarsson, Micaela Bortas, Yanxiang Huang, Cheng-Ming Chen, Liesbet Van der Perre and Ove Edors Department o EIT, Lund University,
More informationNoise. Interference Noise
Noise David Johns and Ken Martin University o Toronto (johns@eecg.toronto.edu) (martin@eecg.toronto.edu) University o Toronto 1 o 55 Intererence Noise Unwanted interaction between circuit and outside world
More informationPower Optimization in Stratix IV FPGAs
Power Optimization in Stratix IV FPGAs May 2008, ver.1.0 Application Note 514 Introduction The Stratix IV amily o devices rom Altera is based on 0.9 V, 40 nm Process technology. Stratix IV FPGAs deliver
More informationJan M. Kelner, Cezary Ziółkowski, Leszek Kachel The empirical verification of the location method based on the Doppler effect Proceedings:
Authors: Jan M. Kelner, Cezary Ziółkowski, Leszek Kachel Title: The empirical veriication o the location method based on the Doppler eect Proceedings: Proceedings o MIKON-8 Volume: 3 Pages: 755-758 Conerence:
More informationAGN 008 Vibration DESCRIPTION. Cummins Generator Technologies manufacture ac generators (alternators) to ensure compliance with BS 5000, Part 3.
Application Guidance Notes: Technical Information from Cummins Generator Technologies AGN 008 Vibration DESCRIPTION Cummins Generator Technologies manufacture ac generators (alternators) to ensure compliance
More informationSignal segmentation and waveform characterization. Biosignal processing, S Autumn 2012
Signal segmentation and waveform characterization Biosignal processing, 5173S Autumn 01 Short-time analysis of signals Signal statistics may vary in time: nonstationary how to compute signal characterizations?
More informationImage Characteristic Based Rate Control Algorithm for HEVC
Image Characteristic Based Rate Control Algorithm or HEVC Mayan Fei, Zongju Peng*, Weiguo Chen, Fen Chen Faculty o Inormation Science and Engineering, Ningbo University, Ningbo 352 China *pengzongju@26.com;
More informationRC AUTONOMOUS CIRCUITS WITH CHAOTIC BEHAVIOUR
Radioengineering R Autonomous ircuits With haotic Behaiour Vol., No., June 00. BERNÁT, I. BALÁŽ eter BERNÁT, Igor BALÁŽ Department o Radio and Electronics Faculty o Electrical Engineering and Inormation
More informationSPEECH ENHANCEMENT BASED ON ITERATIVE WIENER FILTER USING COMPLEX SPEECH ANALYSIS
SPEECH ENHANCEMENT BASED ON TERATVE WENER FLTER USNG COMPLEX SPEECH ANALYSS Keiichi Funaki Computing & Networking Center, Univ. o the Ryukyus Senbaru, Nishihara, Okinawa, 93-3, Japan phone: +(8)98-895-8946,
More informationA Novel Off-chip Capacitor-less CMOS LDO with Fast Transient Response
IOSR Journal o Engineering (IOSRJEN) e-issn: 2250-3021, p-issn: 2278-8719 Vol. 3, Issue 11 (November. 2013), V3 PP 01-05 A Novel O-chip Capacitor-less CMOS LDO with Fast Transient Response Bo Yang 1, Shulin
More informationA technique for noise measurement optimization with spectrum analyzers
Preprint typeset in JINST style - HYPER VERSION A technique or noise measurement optimization with spectrum analyzers P. Carniti a,b, L. Cassina a,b, C. Gotti a,b, M. Maino a,b and G. Pessina a,b a INFN
More information1319. A new method for spectral analysis of non-stationary signals from impact tests
1319. A new method for spectral analysis of non-stationary signals from impact tests Adam Kotowski Faculty of Mechanical Engineering, Bialystok University of Technology, Wiejska st. 45C, 15-351 Bialystok,
More informationCustom Design of an Analogue Input Digital Output Interface Card for Small Size PLCs
American Journal o Applied Sciences 4 (7): 479-483, 2007 ISSN 1546-9239 2007 Science Publications Custom Design o an Analogue Input Digital Output Interace Card or Small Size PLCs Mohammad A. k. Alia Division
More informationMOHD ZUL-HILMI BIN MOHAMAD
i DE-NOISING OF AN EXPERIMENTAL ACOUSTIC EMISSIONS (AE) DATA USING ONE DIMENSIONAL (1-D) WAVELET PACKET ANALYSIS MOHD ZUL-HILMI BIN MOHAMAD Report submitted in partial fulfillment of the requirements for
More informationTHE performance achievable by a human operator using. Model-Based Cancellation of Biodynamic Feedthrough Using a Force-Reflecting Joystick
SUBMITTED TO: ASME JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL Model-Based Cancellation o Biodynamic Feedthrough Using a Force-Relecting Joystick R. Brent Gillespie and Szabolcs Sövényi Abstract
More informationTool Condition Monitoring using Acoustic Emission and Vibration Signature in Turning
, July 4-6, 2012, London, U.K. Tool Condition Monitoring using Acoustic Emission and Vibration Signature in Turning M. S. H. Bhuiyan, I. A. Choudhury, and Y. Nukman Abstract - The various sensors used
More informationThe fourier spectrum analysis of optical feedback self-mixing signal under weak and moderate feedback
University o Wollongong Research Online Faculty o Inormatics - Papers (Archive) Faculty o Engineering and Inormation Sciences 8 The ourier spectrum analysis o optical eedback sel-mixing signal under weak
More informationISSUE: April Fig. 1. Simplified block diagram of power supply voltage loop.
ISSUE: April 200 Why Struggle with Loop ompensation? by Michael O Loughlin, Texas Instruments, Dallas, TX In the power supply design industry, engineers sometimes have trouble compensating the control
More informationPotentiostat stability mystery explained
Application Note #4 Potentiostat stability mystery explained I- Introduction As the vast majority o research instruments, potentiostats are seldom used in trivial experimental conditions. But potentiostats
More informationGlobal Design Analysis for Highly Repeatable Solid-state Klystron Modulators
CERN-ACC-2-8 Davide.Aguglia@cern.ch Global Design Analysis or Highly Repeatable Solid-state Klystron Modulators Anthony Dal Gobbo and Davide Aguglia, Member, IEEE CERN, Geneva, Switzerland Keywords: Power
More informationSAW STABILIZED MICROWAVE GENERATOR ELABORATION
SAW STABILIZED MICROWAVE GENERATOR ELABORATION Dobromir Arabadzhiev, Ivan Avramov*, Anna Andonova, Philip Philipov * Institute o Solid State Physics - BAS, 672, Tzarigradsko Choussee, blvd, 1784,Soia,
More informationTime-Frequency Analysis Method in the Transient Power Quality Disturbance Analysis Application
Time-Frequency Analysis Method in the Transient Power Quality Disturbance Analysis Application Mengda Li, Yubo Duan 1, Yan Wang 2, Lingyu Zhang 3 1 Department of Electrical Engineering of of Northeast
More informationChapter 4 SPEECH ENHANCEMENT
44 Chapter 4 SPEECH ENHANCEMENT 4.1 INTRODUCTION: Enhancement is defined as improvement in the value or Quality of something. Speech enhancement is defined as the improvement in intelligibility and/or
More informationEstimating the Resolution of Nanopositioning Systems from Frequency Domain Data
01 IEEE International Conerence on Robotics and Automation RiverCentre, Saint Paul, Minnesota, USA May 14-18, 01 Estimating the Resolution o Nanopositioning Systems rom Frequency Domain Data Andrew J.
More informationTime-Frequency Analysis of Shock and Vibration Measurements Using Wavelet Transforms
Cloud Publications International Journal of Advanced Packaging Technology 2014, Volume 2, Issue 1, pp. 60-69, Article ID Tech-231 ISSN 2349 6665, doi 10.23953/cloud.ijapt.15 Case Study Open Access Time-Frequency
More informationIntroduction to OFDM. Characteristics of OFDM (Orthogonal Frequency Division Multiplexing)
Introduction to OFDM Characteristics o OFDM (Orthogonal Frequency Division Multiplexing Parallel data transmission with very long symbol duration - Robust under multi-path channels Transormation o a requency-selective
More informationSHOCK AND VIBRATION RESPONSE SPECTRA COURSE Unit 4. Random Vibration Characteristics. By Tom Irvine
SHOCK AND VIBRATION RESPONSE SPECTRA COURSE Unit 4. Random Vibration Characteristics By Tom Irvine Introduction Random Forcing Function and Response Consider a turbulent airflow passing over an aircraft
More information